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Both the Von and Voff output voltages use an external diode and a capacitor multiplier to regulate the output. Because the AAT2820 does not use high inductance, it can be designed to be ultra-thin with a height of only 0.8mm.
The AAT2820's switching frequency is 1MHz, allowing designers to use ultra-small external capacitors. It integrates a soft-start circuit to protect the device from excessive inrush current during startup. Its low power shutdown feature disconnects the load from Vin, reducing the quiescent current to less than 0.1μA. Its thermal protection circuit turns off all charge pumps when the die temperature exceeds a preset value.
AnalogicTech Introduces Triple Output Charge Pump Regulator
Advanced Analogic (AnalogicTech) has introduced a three-output charge pump regulator, the AAT2820, for battery-powered portable products. To meet the market demand for TFT LCD and CCD image sensors, this power management device provides three adjustable output voltages for open gate drive bias (Vpos), turn-off gate voltage bias (Vneg), and logic voltage.